Well got the twist in green but they had no nova minis, so went with a Stardust v2...
I'm not sure what top coil needs to be broken in means, but I can tell you it tastes like plastic or chemical right now. I prefer to toss my 510 atomizers on the twist compared to this thing.
Hopefully I can find an online store that is under $10 shipping to get a vivid nova mini next week.
Sorry I've never used a stardust, but I bought my firebird bottom coil cartomizers at Canvape. They are awesome. Have had the same ones since I started in December. They will run you about 10$ for 5. They hold 1.5 ml. You can't beat them for taste or vapor- no heads or wicks to change and easy to clean and refill. They come with a syringe and a tip. You use the syringe to fill them. I have picked them up at the flea market in Brampton. I have tried all different kinds and these work the best for me. Don't give up- once you find something that works for you, it gets easier. They work with the Twist and Mini as well. They are also called Ce3's